Device for stretching skins



Nov. 5, 1935. I A. w. Q. MNTA'G l 2,929,199

DEVICE FOR STRETCHING SKINS Filed Julyvzv, 1933 Yto 'PatenteNoa 5, 1935 Germany January 20, 1933 'Application July av, 193s, serialNu. sacar 1o claims. (crus-21) Y The present invention relates to an improved stretching device'for skins orl hides.` The novel device permits an'equal uni-directional stretching of the skin'inv all portions which is of par 6 ticular importance in glovemaking. The invention entirely eliminates the long lasting-and in` accurate stretching of skins or hides by hand as now practiced. Stretching apparatus'has been used, which. however, causes the skin to stretch 10 to a larger degree on the outer than in the middle portions; the-latter disadvantage is valso eliminated by the present invention whichfor the reasons set forth is of great value in glovemaking.

present invention to provide an improved stretching device adapted to uniformly stretch all portions of'the skin in a predetermined direction. A further object is to provide a stretching t device consisting of two stretching frames between which the skin is engaged.

Other objects and advantages oi the invention Willy-be seen from the following specification and theclaimsv jf y i The novel device comprises two frames, each frame consisting of a plurality of pivotally con- 1 -nected .bars; theframes are laid oneabove the other and the -skin is inserted between the frames. Projections are provided on, the pivots of the previously mentioned bars the projections of both frames being brought into register so as to engage the skin. If the frames .are pressed each 'against the skin and if'the'bars are then 35 moved about their pivots, the skin being -nrmiy "held'between' the' frames will be stretched in one ydirection to the desired degree. The degree of stretching'may be determined by means of a gauge.

shown in the accompanying drawing:

Fig. 1 showsthe .upper frame; y Fig. 2 shows the lower frame with a skin; Fig. 3 shows the position which the lower ,45' frame )and the skinassume if-the device is-in stretching position. f 1 Fig. 4 is an enlargedfragmentary view in perspective showing the intersection of two barsof per frame.

Fig. 5 isiafview in elevation showing the detailed construction of the pivot pin. Fig. 6 is a view in elevation showing the pivot piii employed to pivotally connect the cross bars in the lower frame.

. Fig. 'l shows the gauge for stretching of the skin.

`As willbe seen from the drawing, theskin stretchingdevice consists of two similar upper and lower frames I and 2; each frame consists determining the It is therefore one of the mainobjects of lthe A preferred embodiment of theinvention is" the respectively'parallel sets thereofin the upv'of' two-'sets of parallel bars and -4, Vthe one set crossing the other one, and said bars are pivotconnected to eachother at the crossing points. The middle -b'ars 5 ofeach frame are stronger andserve as actuating bars for contracting and extending the frames for stretch- -ing the The various bais of each frame areconnected on the crossing points by screws 6;. 6'V in s uch a manner'that they may easily pivotbut cannot move relatively to their pivots.- l0

The connecting screws of the various bars of the lowerframe 2 form the pivots and are provided with, a slightly rounded projecting head1 which is roughened on the surface in order to firmly grip vthe skins andrprevent thesame from slip '15 ping. When tender skins are to be stretched it is advisable to provide the screws 6 with a rounded rubber head in order to prevent any damage to' the skin. The connecting screws 6' for theb ars of the Vupper frame constitute the pivots 20 and areprovided `with a larger head. 9 which is accurately bored out to formthe seat for a r'ub- 4berblock IU' (Fig. 5) which normallyis held in the seat ofthe head 9 so -that upon lowering of the `upper frame -I upon the lower frame 2 the 25 l skin will not be damaged due to the :relatively heavy weight of said upper frame. In this connection it must be mentioned that the frames ,aresuf'llciently heavy s'o that no further clamping means are necessary when the upper frame 30 is'rest'ing upon the lower one.Y

It will be seen that on the pivots of the bars Loi' the lower frame I the heads 'I ofthe bolts 6 form a support for the skin while the rubber blocks I 0 of the bolts 6 of the upper frame engage the skin from the.upper side thereof.

The actuating bars 5 of each frame are provided at each end with a hole I I through which a pin (not shown) -may be passed in order to hold the. frames in register. It is, of course,- also possible to provide any other means serving the same purpose.

The gauge I2 (Figs..7 and 8) used for securing the frames in stre'tchingposition and for determining the degree of stretching is provided with slots. I 3 at both ends which act as guides in which slide the pins which pass through the ends of said actuating bars.' The gauge I2 is also provided withA holes I4- adapted to receive securing bolts or pins in order to secure the frames in the adjusted 'stretching position.V 0f course, many y variations may' be made in these constructions.

upon the lower frame, if desired or necessary, the upper frame can be loaded by weights so that the skin is firmly held in engagement therebetween by the heads of the pivot screws of the various bars. The gauge is then placed upon the ends of the bars 5, the initial position noted, and

both frames are then actuated slightly beyond the desired degree of stretch to eliminate any back-movement of the skin. The frames are then secured in their adjusted position by passing bolts through the desired holes I4 in thegauge so that the frames may be maintained in said adjusted position.

Due to the equal spacing of the connecting screws of the various bars and due to the firm clamping of the skin between the frames, the skin is forced to uniformly follow the slightest movements of the frames in exactly the same manner and thereby an absolutely equal unidirectional stretching of the skin in its smallestv Many modifications may, of course, be provided,

without departing from the spirit of the invention.

What 'I claim is: 1. A device for stretching skinsor hides in a predetermined direction, said device comprising two registering frames eacli consisting of a set of parallel bars and a second set of parallel bars crossing the bars of said first set, pivots connecting the bars in each of said setsto the bars in the other at the crossing points, and projections on said pivots in the adjacent faces of the frames to engage and firmly hold the skin therebetween. 2. A device for stretching skins or hides in a predetermined direction, said device comprising two registering frames each consisting of a set of parallel bars and a second set of parallel bars crossing thebars of said first set, pivots connecting the bars in each of said sets to the bars in the other at the crossing points, projections on said pivots in the adjacent'f'ac'es of the frames to engage and flrmly hold the skin therebetween,

, and means for maintaining the frames in stretching position. I

3. A device for stretching skins or hides-said device comprising two registering frames each consisting of a set -of parallel bars and a second set of parallel bars crossing the bars of said firstv set, pivots connecting the bars in each ofsaid sets to the bars of the other at the crossing points,

the center bar in each of Athe sets of bars in the frames extending beyond said frames and constituting an actuating bar therefor, and projections on the pivots in the adjacent faces of the frames to engage and firmly hold the skin therebetween.

4. A device for stretching skins or hides, said device comprising two registering frames each consisting of a set of parallel bars and a second set of parallel bars crossing the bars of said first set, pivots connecting the bars in each of said sets to the bars of the other at the crossing points, the-center bar in each of. the sets of bars in the frames extending beyond said frames and constituting an actuating bar therefor, projectionsl onthe pivots in theadjacent faces of the frames to engage and rmly hold the' skin therebetween, and means for maintaining the frames in stretching position.

5. A device-for stretching skins or hides, said device comprising two registering frames each 5 consisting of a set of parallel bars and a second set of parallel bars crossing the bars of said first set, pivots connecting the bars ineach of said sets to the bars of the other at the crossing points, the center bar in each of the sets of bars inthe 10 frames extending beyond said frames and constituting an actuating bar therefor, projections on the pivots in 'the adjacent faces of the frames to engage and firmly hold the skin therebetween, and means associated with said actuating bars 15 for determining the degree to which the skins are stretched.

6. A device for stretching skins or hides, saiddevice comprising two registering frames each consistingof a set of parallel bars and a second 20 y set'of parallel bars crossing the bars of said iirst set and pivotally connected thereto at the crossing points, one of said bars in each of said sets extending beyond the frame and Aconstituting an actuating bar therefor. 1 25 '7. A device for stretching skins or hides, said device comprising vtwo registering frames each consisting of a set of parallel bars and a second set of parallel bars crossing the' bars of sai'd first set and pivotally connected thereto vat the crossing points, one of the 'bars in each of said sets being of vgreater cross section area thanthe others and extending beyond the framesA to constitute actuating bars therefor.

8. A device for stretching skins or hides, said device comprising two registering frames each consisting of a set of parallel bars and a second set of parallel bars crossing the bars of said rst set and pivotally connected thereto at the crossing points, one of the bars in each of said 'sets o being of greater cross section area than the others and extending beyond the frames constituting an actuating bar therefor, and means for maintaining the frames invstretching position.

9. A device for stretching skins or hides, said 5 device comprising two registering frames each consisting of a set of parallel bars and a second set of parallel bars crossing the bars of said rst set and pivotally connected thereto at the crossing points, one oi' the bars in each of said sets w being of greater cross section area than theothers and extending beyond the frame constitutinglan actuating bar therefor, and mea'ns associated with said actuating bars for determining the degree to which the skins are stretched.

10. A device for stretching skins or hidesin a predetermined direction, said device comprising j two registering frames eachconsisting of a set of parallel 'bars anda, second set of parallel bars crossing the bars of said rst set, pivots connectw ing the barsv in each of said sets to the bars in the other set at the crossing points, projections on said pivots inthe adjacent faces, of the frames, and resilient means mounted inthe projections of the pivots in oneof said frames arranged to u cooperate with the projections on the pivots of the other frame and engage and firmly hold the skin therebetween', the projection on the pivots in' said other frame being rounded.

AUGUST WILHELM oem MONTAG. Y i" 

